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Instrumentation > Physics N Math > Flashcards

Physics N Math Flashcards

1
Q

Difference between scientific and engineering notation

A

Scientific base 1 to 10 exponent also base 10 ie 5 × 10^25
Eng base 1 to 1000 exponent base 10 BUT exponent multiple of 3
976 × 10^6

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2
Q

Easiest way to divide a fraction?

A

Cross multiply(keep, switch, flip)
- keep 1st fraction
- switch to multiply
- flip 2nd fraction

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3
Q

2/5 + 3/7

A

29/35

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4
Q

2/3 × 15/16 =

A

30/48 (5/8)

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5
Q

Is 3:2 equivalent to 7069:4712?

A

3/2 = 1.5
7069/4712 =1.5002
So yes

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6
Q

% change =

A

(Final amount- initial amount/initial amount ) ×100

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7
Q

A (math) term is:

A

Any variable you separate with a +,-,or = sign

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8
Q

A factor(math ) is

A

Any variable you separate with a × or ÷
Can be implied like 4ab.
The 4 a and b are all factors

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9
Q

Number that describes growth?
How is it set up in the calc?

A

2.71828
E^x

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10
Q

At 360 degrees (circle) how many radians

A

2 pi

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11
Q

At 180 degrees( circle) how many radians

A

1 pi

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12
Q

If 2 angles add upto 180 they are?
90 they are?

A

180 = supplementary
90 = complimentary

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13
Q

X= sin 25.3 degrees
Side length 15
Find x

A

15
Sin
25.3
X = 6.41036

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14
Q

Cos A = .8346
Find A

A

2nd + cos (0.8346)
A = 33.4257

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15
Q

If a full tank is .5m high, liquid density is 998.2 and gravity is 9.81
What is the kpa?

A

4.896

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16
Q

Def hydrostatic pressure

A

Pressure developed by a column of liquid

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17
Q

Newtons 1st law

A

Object in motion stays in motion and object at rest stays at rest till acted on by an equal or greater force

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18
Q

Newtons 2nd law

A

The more mass the less accelerate, the harder you push the more accelerates

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19
Q

Newtons 3rd law

A

For every action there is an equal and opposite reaction

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20
Q

Distance def:
Symbol

A

The total length of the path an object follows
d

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21
Q
  • Displacement def:
  • Symbol?
A

The straight line distance and direction from an objects starting point to its final position
d with line over

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22
Q

V = d/t stands for

A

Average speed
Distance = speed / time
Average velocity
Displacement = velocity/time

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23
Q

A = Vf - Vo / t stands for

A

A = acceleration
Vf = final velocity
Vo = initial velocity
T = time

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24
Q

Velocity is speeding up if

A

A = + and v = +
Or
A = - and v = -

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25
Q

g =
Sooo

A

-9.8 m/s^2
So always - on velocity

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26
Q

Tension def:

A

Force through a “rope”

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27
Q

V = VoT + .5 at^2 is for

A

Velocity as a unit of time

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28
Q

V = Vo + at is for

A

How far have I gone in a straight line as a unit of time?

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29
Q

V^2 = Vo^2 + 2ax is for

A

Velocity as a function of distance

30
Q

3 1lb (1 inch ^2) boxes staked on top of each other
Force?
Pressure?

A

F = 3lbf
P = 3lbf/in^2

31
Q

3 1 lb (1 inch ^2)boxes side by side
Force?
Pressure?

A

F = 3 life
P = 1 lbf/in^2

32
Q

A winch lifts a 2 kg weight up 4.5 m
What is the output of the winch

A

W = f x d
W = (2kg × 9.81 m/s^2) x 4.5
W = 19.62 x 4.5
W = 88.29 N

33
Q

Def work
Units

A

W = applied force x distance
U = 1 Joule ( 1N force through 1M displacement)

34
Q

Def power
Units

A

Scalar rate of doing work.
P = W/t unit J/s
1 J/s = 1 watt

35
Q

A truck is driving down a road ar 10000N force. How much work in Mega joules in 100m of road

A

W= force x distance
W= 10000 × 100
W= 1000000 N
W = 1 MN

36
Q

Ek = 1/2 mv^2 is for

A

Kinetic energy

37
Q

Ep= mgh is for

A

Gravitational potential energy

38
Q

Pressure triangle vs ohms law

A

F = V
P = I
A = R

39
Q

Def : energy

A

The CAPACITY to do work

40
Q

Def : energy

A

The CAPACITY to do work

41
Q

Ep = 1/2 kx^2 is and is for

A

Spring potential
K = spring constant in n/m
X = distance stretched/compressed
In m

42
Q

F = k x is and is for

A

Hooks law
Force to stretch or compensate a spring fully
K = spring const
X = distance

43
Q

For calculations with F ex( w = f×d)
What must you do

A

Remember F = mass x acceleration

44
Q

V = root (2Ek/m) is for

A

Velocity from potential energy
Ek = 1/2m v^2 formula

45
Q

Element def

A

Cannot break down by chemical means to a simpler substance

46
Q

Compounds def

A

Can break down to simpler substances. Contain 2 or more elements

47
Q

A pipe reduces from(a) 34 cm to(b) 20 cm.
The flow rate at a is 1 m/s. What is it at b?

A

D1 V1 = D2V2
34 cm^2 × 1 m/s = 20 cm^2 × V2
34^2 / 20^2 = 20^2 × V2
1156/400 = V2
2.89 m/s = V2

48
Q

Total energy at point 1 is = to point 2 (assuming no friction losses) is _____ equation

A

Bernoullis

49
Q

Cohesion is

A

Attraction between molecules of the same type

50
Q

Adhesion is

A

Attraction of molecules of a different type

51
Q

Intermolecular forces

A

Attraction / repulsion between neighboring molecules (weak)

52
Q

Intra molecular

A

Keep a molecule together (strong)

53
Q

Density is _____ of _____
Formula

A

Inverse of specific gravity
P = Mass/Volume

54
Q

Vg = Volume/Mass formula for

A

Specific gravity

55
Q

P = Fg/a is for

A

Hydrostatic pressure

56
Q

Pliguid = pgh

A

Pressure at any depth
p= density
g= gravity
h= depth

57
Q

Force on an object that keeps it from sinking is

A

Apparent weight

58
Q

Reynolds # below 2000 is
Above 4000
Between

A

Above : turbulent
Below : laminar
Between: transitional

59
Q

Fb = (Pr) × (g) × (Vd) is

A

Buoyant force
Pr : displaced fluid density
g : gravity
Vd : displaced fluid volume

60
Q

🔺️L = a L 🔺️ T or aL0( Tf-To ) is and is for

A

Linear expansion
🔺️ L = change in length
A = coefficient
L0 = original length
🔺️ T = temp change

Tf final temp
To original

61
Q

What is latent heat of fusion

A

The amount of energy required to change a substance from its solid phase to liquid at its melting point without a change in temp

62
Q

With an incline plane it takes the same amount of energy to push it up as

A

Lifting straight up

63
Q

MA = d1/d2 is

A

MA : mechanical advantage
D1: distance 1 ( whole thing)
D2: effort arm

64
Q

MA difference between load ropes and effort ropes

A

Load support (up)
Effort ropes actually pulling
If pulling up on a pull then the pull rope is also a load rope

65
Q

Volume of a sphere

A

(4/3) pi × r^2

66
Q

If using an axle to lift a bucket of water which is the load , which is the effort

A

Bucket = load
Axle/fulcrum = effort

67
Q

If there are 5 ropes on pulleys and 1 pull rope. You lift a load 20 feet how much rope do you pull?

A

100 feet

68
Q

A bellows is pushing up w 100n force 1.5 m down a fulcrum. Another bellows is 1 m further down pushing up how much force to equal

A

100 × 1.5 = X × 2.5
= 60 n

69
Q

Difference between gauge pressure and absolute ( formula)

A

P gauge = P abs - P atm

70
Q

P = Po = pgh is for

A

Absolute pressure

Instrumentation (6 decks)

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